Fix in parseKeepRef.

frontend/src/js/arvados/process/wb-process-misc.js

@@ -3,7 +3,7 @@ function encodeURIComponentIncludingDots(s) {
 }
 
 function parseKeepRef(value) {
-  if (typeof(value) === 'object' && 'location' in value && value.location.startsWith('keep:'))
+  if (value && typeof(value) === 'object' && 'location' in value && value.location.startsWith('keep:'))
     return value.location.substr(5);
   return value;
 }